By now I know:
There is one value for military ships (determinde by research +?)
One for Colony bases (infite?)
One for Bases build away from colonies
One for ships build on colonies (Constructor & colonoy...)
But I stumbled upon a carrier design from the AI, which had a a size of 758, while my maximum ship size was 650 at this time. Given carriers were also build by the dozen.
So... is there something more I don't know or did I stumble upon a bug? Anyone know more maybe?

